Add time:08/09/2019         Source:sciencedirect.com

The complex formation between cadmium(II) ions and chloride and bromide ions in the melt of 0.8CH3CONH20.2Ca(NO3)2·4H2O has been studied at six temperatures between 30 and 80°C. The formation constants of the complexes CdX+ and CdX2 (X=Cl, Br) were determined from emf measurements by means of Ag/AgX electrodes. The thermodynamic parameters ΔHmno and ΔSmno for the stepwise complex formation CdmXn−12m−n + X−←→CdmXn2m−n have been estimated. The results are ΔH11o = 4.2 kJ mol−1. ΔS11o = 52.4 J K−1 mol−1, ΔH12o = 3.3 kJ mol−1, δS12o = 40.7 J K−1 mol−1 for the chloride complexes and ΔHi11o = −3.3 kJ mol−1, ΔS11o = 33.0 J K−1 mol−1, ΔH12o = −2.5 kJ mol−1, ΔS12o = 30.4 J K−1 mol−1 for the bromide complexes. The parameters are compared with the literature data for the same process in dilute aqueous solutions and in some hydrated salt melts.

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